Design of the National Water-Quality assessment Program : occurrence and distribution of water-quality conditions / by Robert J. Gilliom, William M. Alley, and Martin E. Gurtz (U.S. Geological Survey circular ; 1112)
Design of the National Water-Quality assessment Program : occurrence and distribution of water-quality conditions / by Robert J. Gilliom, William M. Alley, and Martin E. Gurtz